Eur. Phys. J. D (2012) 66: 7
https://doi.org/10.1140/epjd/e2011-20530-4

Regular Article

On relativistic shifts of negative-ion resonances

KTH-Mechanics, Royal Institute of Technology, 10044 Stockholm, Sweden

^a e-mail: ket@mech.kth.se

Received: 11 September 2011
Received in final form: 18 October 2011
Published online: 11 January 2012

Abstract

Results from a Dirac approach to electron- (neutral) atom resonance calculations are compared with those from nonrelativistic ones. A recently developed amplitude-phase method for the Dirac equations that is valid also in the non-relativistic limit is applied. The main conclusion is that significant energy differences are expected for long-lived resonances.